That's slightly irrelevant now as the screw has sheered off... It wasn't apparent that the screw had sheered as it appeared the nut was turning fairly happily... Basically need a solution for properly joining the earth to the PSU casing.

danielj wrote:I'm wondering if I can just unfill the old head, unscrew it and do as Mark said. I can't work out what size screw it was - it seems to be 4.4mm diameter... That doesn't seem to correlate to anything?

My plan is this - I've found an M3 tap, SO:cut the rest of that one off, drill 2.5mm hole in from left on the flange there, countersink, tap with M3, put M3 machine screw in, screw everything to that, breath.